Drill.



F. E. SNYDER.

DRILL.

APPLICATION FILED P33. 7, 1908.

Patented 0011.27, 1908. I

8 SHEETS-SHEET 1.

INVENTOk 5,

Altomy F. E. SNYDER.

DRILL.

APPLIOA'IIOH FILED FEB-"l, 1908.

Patented 001;. 27, 1908.

3 SHEETS-SHEET 2.

F, Bi SNYDER.

DRILL.

APPLIOATIOIPILED FEBJ, 1908.

Patented Oct. 27,1908.

4s SHEETS-SHEET a.

INVENTOR v Allarney PATENT OFFICE.

- UNITED sTATEs FRANK EDWARD SNYDER, OF MASSILLON, OHIO. I

DRILL.

hereby declare the following to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. i

This invention relates to improvements in drills, and more particularlyto such as' are etc.

adapted for use in drilling coal, rock, metal,

Many hand drills nowin use comprise a threaded feed-bar or rod to whichthe drill and its chuck are rigidly secured, so that in use, by rotatingth1s feed-rod, the drill is forced into the coal with a speedcommenswrate with the size of the thread on said bar, varyin from eight totwelve threads'per inch, depen in upon the hardness of the material bemgdril ed. Such a device requires a comparatively fine thread, as indrilling, hard spots in coal, such as sulfur, stone, etc., are

often encountered and through which the drill could not be forced werethe feed-rod provided with a coarse thread. The fine thread (V shaped incross section) on the feed-rod causes considerable friction and soonwears out, frequently necessitating the recutting of the threads both onthe feederod and in the thread box through which it passes.

With a drill as heretofore constructed, on the lines above mentioned, itisoften necessary when strikin a hard spot in the coal, to remove thedrill as it cannot be forced in further until the hard substance hasbeen broken with a bit or lon chisel and hammer, because the drillcannot e turned without feeding or turning the feed-rod.

The object of my present invention is to obviate the defects of drillsas heretofore conbecome dull so as to cause too much pres-.

sure agaist the feed-rod or in .due strars. or. the device, the actuati:g means for the feedrod will be caused to rotate backwardly and saidfeed-rod to remain stationary; but fol- Specification of Letters Patent.Application filed February 7, 1908. Serial No. 414,116.

Patented Oct. 27, 1908.

I low up and feed again as the drill bit (which continues to rotate),cuts its way clear.

A further object is to construct a drill In such manner that thefeed-rod can be rotated without rotating the drill bit and thus enablethe bit to be withdrawn in case of clogging and at the same time cleanthe holel'of chips which may have caused such clogging.

A further object is to construct the inachine in such manner that thefeed-rod and:

drill bit can be rotated simultaneously at dif-' ferent speeds or at thesame speed.

, A further object is to provide a drlll in which the drill rod isrotatable in the feedrod, which shall be capable of being manipus 'latedin a manner to provide for all contin gencies which may arise during therocess of drilling; and which shall be simp e in construction, and easyto operate.

'With these objects in view the invention consists in certain novelfeatures of constructionand combinations of arts as hereinafter setforth and pointed out 111 the claims.

" In the accompanyingdrawin s, Figure 1 is a side elevation of a drillembodying my improvements. Fig. 2 is a view in end eleva-. tion andpartly in section. .Fig. 3 is a plan View. Fig. 4 is an enlargedsectional view illustrating the gearing between the drill rod andfeed-bar. Fig. 5 is a detail view of the actuating mechanism. Fig. 6 isa view of the ear housing. Fig. 7 is a view illustrating t e manner ofconnecting the arts of the actuating mechanismto cause t e feed-bar anddrill rod to rotate together at the same speed, and Fig. 8 is a view ofan attachment to be used for operating the feed-bar independently of thedrill-rod.

1 re resents a standard or supporting post, to the% I oted and providedat its ends with pointed feet 3 to engage. the floor of a mine. Thestandard 1 comprises two members 56, theupper member 5 telescoping intothe tubular member 6 and held at any desired vertical adjustment bymeans of a pin 7 passing through holes in the member 6 and any oneof aseries of holes 8 in the member 5. The upper member 5 of the standard ismade with a threaded socket to receive a screw 9, the upper .end ofwhich terminates in a pointed pin 10 to engage the roof of the mine. Thescrew 9 can be turned to clamp ower end of which a cross-bar 2 1s plvthestandard in position, by means of an arm or lever 11. In order toprevent the pin 7 from becoming lost it is attached to the standard bymeans of a chain 12.

A split sleeve 13 is adjustably secured to the standard 1 and isprovided with a yoke 14 made integral therewith. The arms of the yoke 14are provided with bearings 15 for trunnions 16' projecting laterallyfrom a housing 17 and these trunnions can be placed in position on thebearings 15 in the arms of the yoke through openings 18 in the tops ofsaid arms. members hinged together and each member is providedinternally with threads to mesh with the threads of a tubular'feed-rodor bar 19'. The members of the two-part housing 17 are normally lockedtogether by means of a bolt 20 pivoted to one member of the hous ing,passing between lugs 21 on the other member of said housing and providedwith a thumb nut 22 to engage said lugs.

The rear end of the feed-rod or bar 19 is madewith a smooth portion uponwhich a gear-housing 23 is loosely hung. This housing comprises twomembers bolted together and provided with depending projections whichcooperate to form an arm24. This arm may constitute a handle for apurpose hereinafter explained and it also serves to receive the socketedupper end of a pin 25 secured thereto by means of a thumb-screw 26, andto the oin 25a weight 27 is removably attached by means of a thumb screw28,said weight serving to maintain the gearing housing 23 and thegearing therein,

in proper position during the operation of the machine and at the sametime permitting said housing and gearing to move forwardly during thefeeding of the drill.

A gear-wheel 29 is secured to the smooth ortion of the feed-rod or barwithin the ousing 23 and a smaller gear-wheel 30 is secured to thedrill-rod 31 which passes through and projects a short distancerearwardly be yond thefeed-rod or bar 19. A short shaft 32 is mounted inthe housing 23, parallel with the feed-bar and drill-rod, and to thisshort shalt two gears 3334 are secured. The gear 33 is approximately thesame size as the ge ar 30 and meshes therewith, while the gear 32 issmaller and meshes with the gear 29. Theseveral gears are protected bymeans of a gear-case 35 secured to the h0us ing 23.

A chuck 36 is secured to the forward end of the drill-rod 31 for thereception of abit 37. To the rear end of the drill-rod which projectsbeyond the rear end of the feed-bar and gearing an operating handle orlever 38 is at tached. This lever comprises two members adjustablelongitudinally with relation to each other and secured at any desiredadjustment by means of a threaded pin 39 and thumb-nut 40. The free endof this adjust- The housing 17 comprises two able operating lever isprovided with a suit-- able hand grip 4 1. It 1s apparent that if it bedesired to operate the machine by means of a motor, the latter may beconnected by means of a flexible shaft or otherwise with the rear end ofthe drill rodand the hand lever above described dispensed with.

From the construction and arrangement of parts above described it will.be seen that when the operating'lever is manipulated, motion will betransmitted directly to the drill-rod for rotating the same and thatsimultaneously the feed-bar will be rotated through the medium of thegears at a slower rate of speed. During this operation the gear-housingwill be maintained )endulous on the feed-rod by the action of t 1eweight 27, but, as is a parent, may travel forwardly with the eed-rodduring the operation of the machine. If, during the drilling operationthe drill-bit should become stuck 'on account of the clogging of chipsin the hole beingbored, the gear-housing can be revolved so as totransmit through the gearing a backward rotation of the feed-rod withoutrotating the drill-rod, and thus the bit may be withdrawn from the holeand the chippingswhich caused the clogging removed at the same time. Tofacilitate such operation of the gear-housing, the weight 27 may beremoved and the arm 24 used as a handle,- or if desired a hand-wheel 42may be attached to the gear-housing and to facilitate such attachmentthe hand-wheel 42 is provided with a socketed block 43 which isremovably attached to the arm 24.

If, durin the normal operation of the machine, the drill bit shouldengage a very hard spot in the material or become dull so as to causetoo much pressure on the feed-bar or undue strain on the machine, thegear-housing will revolve backwardly andicause the feed-bar to remainstationary, but as soon as the hard spot shall have been penetrated bythe bit, the feed-bar will resume its function,

the resistance which had caused the gearadjusting the weight 27downwardly on the pin 25 to give the necessary pressure .or strength offeed.

Assuming that the feed-bar 19has four threads per inch and that thegears are such that the feed-bar revolves once while the drill-rod makestwo revolutions (the gearhousing remaining stationary), the machine willfeed one inch in ei ht turns of the operating lever 38. ShouTd theoperator not wish to use the weight 27 he can remove it and by holdingthe arm 01' handle 24 the device will feed one inch in eight turns ofthe hold the gear-housin crank or lever 38, and if at any time there istoo much strain on the device or its operation is too hard, the crank orlever 38 can be released occasionally by the operator and the housing 23thus allowed to revolve bacl wardly and stop the feed until thedril-l-bit has cut its way and the excessive pressure,

thereby removed. The operator may then manner above explained when themachine lating the feed, becomes ineffectual.

is disposed in a position which is horizontal or approximately so. Whenhowever, it is necessary to dispose the drill in a positionapproximating the vertical, the automatic action of the weight 27 incontrolling or regpn such case it will benecessary for the operator tohold the gear-housing 23 in proper position and this may be readilyaccomplished bymeans of the arm or handle 24 or by means of thehand-wheel 42 attached to saidgear-housing in the manner hereinbeforeexplained. By holding the handle 24 or the and-wheel 42, the device mustfeed at whatever speed it is geared, but by releasing said handle orhandwheel so as to allow the gearhousing 23 to revolve backwardly as thepressure becomes too. strong or the operating lever turns too hard, thedevice can be controlled perfectly and the pressure or feed increased ordiminished, as occasion may require.

Incident to the construction of my improved drill, I am enabled to use avery coarse thread on the feed-bar and control the speed of feed byvarying the size of gears 3234,' which makes the device quite durableand easy to operate. As the feed-bar and drill-rod can be operatedindependentl I am enabled to control the feed to suit al kinds of workwith the same machine. When turning the operatin crank or lever thedrill rod turns also whet er the feed-rod is rotated or not, and thusthere is little chance for the drill-bit to become'clogged in the holebeing drilled, as by stoppin the feed and continuing to turn thedrill-r0 the I bit will clear itself.

Should it be .desired to use the machine inany substance which is softenough to permit the full feed of the feed-bar to be transmitted to thedrillod,-this may be accomplished by removing the weight 27 from thehousing and attaching to the arm 24 a fork 44 which is made to embracethe operating crank or lever 38. By now operating the crank or lever 38the feed-bar and the drillrod will be caused to rotate together at thesame speed and thus the full feed of which 23 by means of the thefeed-bar is capable is transmitted to the drill-rod.

Having fully described my invention what I claim as new and desire tosecure by Letters- Patent, is,- 7

1. In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a drill rod ext-endingthrough the tubular feed-bar, gears on the feed-bar and drill-rod, agear-housing loosely mounted on and supported by the feed-bar, and gearssup orted by said housing and in constant mesi with the gears on theteed-bar and drill-rod.

2. In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a drill-rod passingthrough the feed-bar, a

pendulous device mounted on the feed-bar,

gears carried by said endulous device and gears secured respectively tothe feed-bar and drill-rod and meshing with the gears carried by thependulous device. I

3. In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a drill rod passing throuh the feed-bar, a gearhousing mounted oosely on the feed-bar, connectedgears carried by said housing, gears on the feed-bar and drill-rod andmeshing with said connected gears, and a weight adjustably attached tothe lower end of said gear-housing.

4. In a drill, the combination with a threaded housing and atubular-threaded feed-bar passing through the same, of a drillrodpassing through the feed-bar, a gearhousing mounted loosely on thefeed-bar and capable of rotation thereon, connected gears carried bysaid gearhousing, gears secured respectively to the feed-bar anddrill-rod and meshing with said connected gears, and operating meansattached to the drill-rod.

5. In afdrill, the combination with a threaded housing and a tubularthreaded feed-bar passing throu h the same, of a drillrod passingthrough t e feed-bar, a pendulous device mounted loosely on thefeed-bar,

connected gears carried by said pendulous device, gears securedrespective y to the feed-bar and drill-rod and meshing with saidconnected gears and detachable means for permitting the feed-bar anddrill rod to be rotated simultaneously at the same speed.

, 6. In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a pendulous devicemounted loosely on the eed-bar, connected gears carried by saidpendulous device, a. drill-rod passin through the tubular feed-bar,gears secure. respectively to the feed-bar and drill-rod and meshingwith said connected gears, an operating lever secured to the drill-rodand detachable means for connecting said pendulous' device with theoperating lever to cause rotation of the feed-bar and drill-rodsimultaneously at the same speed.

7. In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a drillrod passingthrough the feed-bar, operating means secured to said drill-rod, a gearsecured to the drill-rod, a gear secured to the feed-bar, a pendulousdevice mounted loosely on the feed-bar, connected gears carried by saidpendulous device, and means for weighting the lower end of saidpendulous device.

8, In a drill, the combination with a threaded housing and a tubularthreaded feed-bar passing through the same, of a drillrod rotatable insaid feed-bar and passing through the same, an operating lever securedto the drill-rod and comprising a plurality of members. adjustablelongitudinally with relation to each other, gears secured respectivelyto the feed bar and drill-rod, a pendulous device mounted loosely on thefeed-bar, connected gears carried by said pendulous device and meshingwith the gears on the feed-bar and drill-rod, a weight, and means foradjustably attaching said weight to the pendulous device.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

FRANK EDWARD SNYDER.

Witnesses JOHN C. LOWE, JOHN O. GARRETT.

